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Light of wavelength 400 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33.

(a) What is the wavelength of the light in the water?

(b) How many wavelengths are contained in the distance 2t, where t is the thickness of the film? (Do not round your answer to a whole number.)

(c) What is the phase difference between the wave reflected from the top of the air-water interface and the one reflected from the bottom of the water-air interface in the region where the two reflected waves superpose?

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